IsTuple<T>

Overview

A type that determines whether the given type is a tuple type.

Syntax

type IsTuple<T> = T extends any[] | readonly any[]
  ? number extends T['length']
    ? false
    : true
  : false;

• T: The type to check.

Examples

Example #1

type T0 = IsTuple<[]>; // true
type T1 = IsTuple<[number]>; // true
type T2 = IsTuple<[number, string]>; // true

type T3 = IsTuple<any[]>; // false
type T4 = IsTuple<unknown[]>; // false
type T5 = IsTuple<number[]>; // false
type T6 = IsTuple<Array<number>>; // false
type T7 = IsTuple<ReadonlyArray<number>>; // false